Úloha ID 2822 - 
100 ml roztoku vzniklo rozpuštěním 24,38 g NaOH v 97, 52 g rozpouštědla. Jaká je hustota roztoku? Jaká je hmotnostní koncentrace NaOH v tomto roztoku?
Správná odpověď je: A
Hmotnostní koncentrace se běžně značí řeckým písmenem ρ, v tomto výpočtu bude pro přehlednost značena HK (písmenem ρ bude značena hustota). Výpočet tedy bude vypadat následovně:
m(celková) = 24,38 + 97,52 = 121,9
ρ = m(celková)/V = 121,9/100 = 1,219 g/cm3
HK = m(NaOH)/V = 24,38/100 = 0,2438 g/ml = 243,8 g/l.
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